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The story revolves around Duke Fleed who is a survivor of the Vega Star, raised by Dr. Umon as his adoptive son, and known as Daisuke Umon on Earth. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his kid sister Maria Grace), Duke decides to fight back using his best weapon, the almighty Grendizer.
Brothers of the Universe
Prince of the Other World
The Tragic Fiesta
The Island of Fear
The Pitfall of Death
Attack on Perlepolis
The Feast of the Wolves
The Radars are Off
The Black Moon Camp
Vega's Spy
The Day when the Sun will Stop
Blood on Snow
By Iron and by Fire
The Day of the Rising Sun
Red Akerae
The Fiancé of Death
The Infernal Ride
The New Time of the Caves
The Crushed Town
Earth in Danger
The Submerged Continents
The Slayers of the Sky
The Flood of the New Worlds
The Enforcer
Fleed's Lovers
The Edges of the Abyss
Win or Perish
The New Masters of Darkness
The Fire Bird
The Lightning Rock
A Dreamer from Outer-Space
The Ghost Queen
The Wings of Death
The Mercenary of Oppression
The First Raid
The Invincible Cosmos
A Star is Dead
Darkness Makers
The Patrol of Eagles
The Awakening of Volcanoes
Baptism of Fire
Peril in Abode
The Victory of Eagles
When Dogs are Loosened
Ants and Men
The Ballet of Sharks
The Ignited Lake
World in Fusion
The Last Survivor
The Four-Headed Eagle
The Black Star
The Generation Of Monsters
The Beast
The Snake
The Loch Ness Monster
The Lynx of Outer-Space
The Monster And The Child
The Lookalike
The Commando
Rats
Pegasus
Swans
The Polar Bear
5 Minutes To Die
A Great Between The Greats
Death Comes From The Sea
Diving Operation
The Great Pain
Like Father, Like Son
The Imposter
Best Friend
Princess In Love
For The Love Of Earth
This Is Not Goodbye
